(obvious first q) is there anyway i can get this off the tape onto another, preferably with some sort of mixer where i could move the volume of the music over and under the tape at my wishing? (harder q) if so, what machinary will i need, and how much will it cost?
thank you very much.

its not difficult. if you have a mixer, you could hook a walkman up to the mixer, play the transformers stuff, and hit record on the Hifi.

alternatively, if you have a hifi with a double cassette deck, the volume control on the hifi will more-often-than-not control the recording volume onto the tape. this will affect all sources being recorded onto the tape, so if you're trying to mix from one track into another, you're better off with a two mixer!

i think. im sure someone else knows more and wants to shit all over me.